JavaScript prototype Property
 JavaScript Array Object
Definition and Usage
The prototype property allows you to add properties and methods to an
object.
Syntax
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object.prototype.name=value
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Example
Example
In this example we will show how to use the prototype property to add a
property to an object:
<script type="text/javascript">
function employee(name,jobtitle,born)
{
this.name=name;
this.jobtitle=jobtitle;
this.born=born;
}
var fred=new employee("Fred Flintstone","Caveman",1970);
employee.prototype.salary=null;
fred.salary=20000;
document.write(fred.salary);
</script>
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The output of the code above will be:
Try it yourself »
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JavaScript Array Object
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